| Project/Area Number |
12556021
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
食品科学・栄養科学
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| Research Institution | Kyushu University |
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Principal Investigator |
SHIMODA Mitsuya Kyushu University, Agriculture, Bioscience and Biotechnology, Asociate Prof., 大学院・農学研究院, 助教授 (70149871)
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| Co-Investigator(Kenkyū-buntansha) |
IGURA Noriyuki Kyushu University, Agriculture, Bioscience and Biotechnology, Assistant Prof., 大学院・農学研究院, 助手 (30260722)
HAYAKAWA Isao Kyushu University, Agriculture, Bioscience and Biotechnology, Prof., 大学院・農学研究院, 教授 (30038252)
石川 洋哉 九州大学, 大学院・農学研究院, 助手 (00325490)
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| Project Period (FY) |
2000 – 2002
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| Project Status |
Completed (Fiscal Year 2002)
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| Budget Amount *help |
¥12,600,000 (Direct Cost: ¥12,600,000)
Fiscal Year 2002: ¥2,400,000 (Direct Cost: ¥2,400,000)
Fiscal Year 2001: ¥4,800,000 (Direct Cost: ¥4,800,000)
Fiscal Year 2000: ¥5,400,000 (Direct Cost: ¥5,400,000)
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| Keywords | Food Technology / Microbial inactivation / Enzyme inactivation / Non-thermal cell killing / Non-thermal enzyme inactivation / Supercriticalvcarbon dioxide / 食品加工 / 非加熱酵素失活化 |
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| Research Abstract |
The effects of temperature and the concentration of dissolved CO_2 were investigated using a plug-flow system on the inactivation of S. cerevisiae. Several combinations of pressure (4, 6, 8, 10 MPa) and temperature (30, 34, 36, 38℃) were used. The inactivation followed the first-order death kinetics and the effects of the temperature and CO_2 concentration were consistent through the critical temperature and pressure of CO_2. The obtained D-values were 0.14 min at 8 MPa and 38℃, and 0.15 min at 10 MPa and 36℃. The log D-values were related linearly to the treatment temperature and to the dissolved CO_2 concentration. The value of thermal resistance constant (z_<co2>(T)) was 9.5℃ in the media including significant levels of CO_2, and the value of CO_2 resistance constant, z_<temp>(γ)=7.2γ. These results permitted estimation of the D-values at any temperature and any CO_2 concentration.
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